<template>
  <div class="tags-box" v-show="showTagBar">
    <ul>
      <li class="tags-li"
          v-for="(tag, index) in tagsList"
          :class="{'active': isActive(tag.path)}"
          :key="index">
        <router-link :to="tag.path" class="tags-li-title">{{ tag.title }}</router-link>
        <i class="el-icon-close" @click="closeTags(index)"></i>
      </li>
    </ul>
    <div class="tags-close-box">
      <el-dropdown @command="handleTags">
        <el-button size="mini" type="primary">
          标签选项
          <i class="el-icon-arrow-down el-icon--right"></i>
        </el-button>
        <template #dropdown>
          <el-dropdown-menu size="small">
            <el-dropdown-item command="other">关闭其他</el-dropdown-item>
            <el-dropdown-item command="all">关闭所有</el-dropdown-item>
          </el-dropdown-menu>
        </template>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
import {mapGetters} from "vuex";

export default {
  name: "TagsBar",
  computed: {
    ...mapGetters([
        'tagsList',
    ]),
    showTagBar(){
      return this.tagsList.length > 0
    }
  },
  methods: {
    isActive(path){
      return path === this.$route.path
    },
    closeTags(index){
      const delItem = this.tagsList[index]
      this.$store.commit('delTagsItem', {index: index})
      const item = this.tagsList[index] ? this.tagsList[index] : this.tagsList[index - 1];
      // 判断标签栏是否还有标签
      if(item){
        // 判断删除的标签是否是当前页面
        delItem.path === this.$route.path &&
            this.$router.push({path: item.path})
      }else{
        this.$router.push('/back-stage')
      }
    },
    handleTags(command) {
      command === "other" ? this.closeOther() : this.closeAll();
    },
    closeOther(){
      const currentItem = this.tagsList.filter(item => {
        return item.path === this.$route.path
      })
      this.$store.commit('closeTagsOther', currentItem)
    },
    closeAll(){
      this.$store.commit('clearTagsList')
      this.$router.push('/back-stage')
    },
    // 添加标签页
    addTags(route){
      const isExist = this.tagsList.some(item => {
        return item.path === route.path
      })
      if(!isExist){
        if(this.tagsList.length >= 8){
          this.$store.commit('delTagsItem', 0)
        }
        this.$store.commit('appendTagsItem', {
          name: route.name,
          path: route.path,
          title: route.meta.title,
        })
      }
    },
  },
  watch: {
    $route(newValue){
      this.addTags(newValue)
    }
  },
  created(){
    this.addTags(this.$route)
  }
}
</script>

<style scoped>
  .tags-box {
    position: relative;
    height: 30px;
    overflow: hidden;
    background: #fff;
    padding-right: 120px;
    box-shadow: 0 5px 10px #ddd;
  }

  .tags-box ul {
    box-sizing: border-box;
    width: 100%;
    height: 100%;
  }

  .tags-li {
    float: left;
    margin: 3px 5px 2px 3px;
    border-radius: 3px;
    font-size: 12px;
    overflow: hidden;
    cursor: pointer;
    height: 23px;
    line-height: 23px;
    border: 1px solid #e9eaec;
    background: #fff;
    padding: 0 5px 0 12px;
    vertical-align: middle;
    color: #666;
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    transition: all 0.3s ease-in;
  }

  .tags-li:not(.active):hover {
    background: #f8f8f8;
  }

  .tags-li.active {
    border: 1px solid #409EFF;
    background-color: #409EFF;
  }

  .tags-li-title {
    float: left;
    max-width: 80px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-right: 5px;
    color: #666;
    text-decoration: none;
  }

  .tags-li.active .tags-li-title {
    color: #fff;
  }

  .tags-close-box {
    position: absolute;
    right: 0;
    top: 0;
    box-sizing: border-box;
    padding-top: 1px;
    text-align: center;
    width: 110px;
    height: 30px;
    background: #fff;
    box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
    z-index: 10;
  }
</style>
